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Reddit Link Hijack Remover

Remove link-click tracking from reddit

  1. // ==UserScript==
  2. // @name           Reddit Link Hijack Remover
  3. // @author	       jmesmon
  4. // @description    Remove link-click tracking from reddit
  5. // @include        *://reddit.com/*
  6. // @include        *://*.reddit.com/*
  7. // @grant          none
  8. // @namespace      https://github.com/jmesmon
  9. // @license        AGPL3
  10. // @supportURL	   https://github.com/jmesmon/greasy/issues
  11. // @run-at         document-end
  12. // @version 0.0.1.20210226040629
  13. // ==/UserScript==
  14.  
  15. // TODO: consider if run-at document-start is useful, and how we can
  16. // effectively hook urls as they show up in that case (right now it doesn't
  17. // work).
  18.  
  19. (function () {
  20.   'use strict';
  21.   function cl(ac) {
  22.     var a = ac.querySelectorAll('a.outbound');
  23.     var ct_out = 0, ct_aff = 0, ct = 0, ct_in = 0;
  24.     for (var i = 0; i < a.length; i++) {
  25.       /*
  26.       // This is reddit's function to determine the url, which is stored in `o`.
  27.       // It then hooks window unload to call sendBeacon with the url in `o` or
  28.       // modifies the href attribute (if sendBeacon is disabled in config or unsupported by the browser).
  29.       function o(e) {
  30.        var t = $(e),
  31.         r = Date.now(),
  32.         o;
  33.        return t.attr('data-inbound-url')
  34.          ? o = t.attr('data-inbound-url')
  35.          : !n && t.attr('data-outbound-expiration') > r && (o = t.attr('data-outbound-url')),
  36.          o && (i ? s = o : e.href = o),
  37.        !0
  38.       }
  39.       */
  40.  
  41.       // Some minimal counting so we can tell things are working
  42.       if (a[i].getAttribute('data-inbound-url')) {
  43.         ct_in++;
  44.       }
  45.       if (a[i].getAttribute('data-affiliate-url')) {
  46.         ct_aff++;
  47.       }
  48.       if (a[i].getAttribute('data-outbound-url') || a[i].getAttribute('data-outbound-expiration')) {
  49.         ct_out++;
  50.       }
  51.  
  52.       // Goals:
  53.       //  - make sure `o` stays undefined.
  54.       //  - avoid ever getting this function called
  55.       // Removing all the relevent attributes gets us both of those
  56.  
  57.       // Unclear what the purpose of these is, but they are being used to
  58.       // re-write urls (and trigger entry to the fn above), so remove.
  59.       a[i].removeAttribute('data-inbound-url');
  60.  
  61.       // Doesn't appear that reddit is injecting these affiliate links
  62.       // anymore, but no reason to remove this
  63.       a[i].removeAttribute('data-affiliate-url');
  64.  
  65.       // We don't actually need to remove this, but it does short circuit
  66.       // the condition quicker & cleans up the html, so do it.
  67.       a[i].removeAttribute('data-outbound-expiration');
  68.       a[i].removeAttribute('data-outbound-url');
  69.       a[i].classList.remove('outbound');
  70.       ct++;
  71.     }
  72.  
  73.     console.log('hijacks removed: outbound ' + ct_out + ', inbound ' + ct_in + ', affiliate ' + ct_aff + ', examined ' + ct);
  74.   }
  75.  
  76.   var obs = new MutationObserver(function (r, self) {
  77.     for (var i = 0; i < r.length; i++) {
  78.       var ad = r[i].addedNodes;
  79.       for (var j = 0; j < ad.length; j++) {
  80.         var n = ad[j];
  81.         cl(n);
  82.       }
  83.     }
  84.   });
  85.   obs.observe(document, {
  86.     childList: true,
  87.     subtree: true
  88.   });
  89.  
  90.   // TODO: consider patching out window.navigator.sendBeacon (which reddit only uses for this link tracking)
  91.   // TODO: consider blocking the recent_srs cookie used for tracking
  92.   cl(document);
  93. }) ();
  94.